The invention is a method of bonding a first fluid conduit (14) to one or more other fluid conduits (12) or elements such as an electrode (92) or heating element. The method comprises positioning a first fluid conduit (14) substantially in contact with the other fluid conduits or elements (12) wherein a bond region (16) is created. The bond region is wetted with a liquefied thermoplastic polymer (34) which is then subsequently cooled forming a substantially fluid tight bond between the first fluid conduit (14) and the other fluid conduits or elements (14).